Rapper Nelly was one of three new additions announced Wednesday to Summerfest's lineup. He'll be performing at the Miller Lite Oasis July 5; other headliners for the Summerfest stage include LeAnn Rimes, Imagine Dragons, Skillet and Cake. Credit: Ethan Miller

Robert DeLong, 8 p.m. June 26: The emerging electronic artist drew his sound from his past life as an indie rock drummer for his debut full-length album "Just Movement," released in February.

Diplo, 10 p.m. June 26: Born in Mississippi as Thomas Pentz, Diplo first drew attention for his role in crafting pop artist M.I.A.'s intensely kinetic sound, branching off from there to work with acts like Beyoncé and Bruno Mars, and to establish reggae-flavored dance project Major Lazer.

Dropkick Murphys, 10 p.m. June 27: The Celtic punk band, whose most famous song "I'm Shipping Up to Boston" became an unofficial anthem for its native Beantown, raised more than $100,000 for victims of the Boston Marathon bombings by selling a special shirt on its website.

Cake, 10 p.m. June 28: With John McCrea's dry and wry, barely-sung but often sarcastic vocals, Cake carved out a strong following of sing-along spectators with unlikely '90s and early aught hits like "The Distance" and "Short Skirt/Long Jacket."

The Wailers, 10 p.m. June 30: Featuring living members from influential reggae artist Bob Marley's band, the Wailers are experiencing renewed interest thanks to the critically acclaimed documentary "Marley," released last year.

Empire of the Sun, 10 p.m. July 2: The over-the-top Australian electronic duo is dropping its sophomore album, concept album "Ice on the Dune," June 18, five years after it channeled Daft Punk and MGMT on its debut "Walking on a Dream."

LeAnn Rimes, 10 p.m. July 3: Breaking out with the single "Blue" when she was just 13, Rimes, 30, has weathered controversies (including a lawsuit against her father and a very public affair with actor Eddie Cibrian) with acting roles, books and millions of albums sold. The June album "Spitfire" will span across her country and pop pedigree with collaborations ranging from Rob Thomas to Alison Krauss.

Nelly, 10 p.m. July 5: Pass the "Pimp Juice." The St. Louis rapper who found fame and massive sales for pop-rap hybrids like "Country Grammar," "Dilemma" and "Hot in Herre" is returning with new album "M.O.," led by the single "Hey Porsche," seemingly designed for Carly Rae Jepsen and One Direction fans.

Advance tickets are $8 (single day, entry before 4 p.m.) or $15 (single day) if purchased from the Summerfest tickets site by May 5. From May 5 to June 2, advance tickets will be $9 (single day, entry before 4 p.m.) and $16 (single day). Tickets purchased after June 2 and at the gate are $10 for single weekday entry before 4 p.m., and $17 for single day admission.

Summerfest is also offering three-day passes for $39 on its website, and Pick 'n Save locations around southeastern Wisconsin are selling $60, 11-day passes through May 31.